public void FailedValidationTest() { var customerBus = new busCustomer(); var custExisting = customerBus.Load(1); var cust = new Customer() { // create dupe values which should fail validation FirstName = custExisting.FirstName, LastName = custExisting.LastName, Company = custExisting.Company }; cust = customerBus.NewEntity(cust); Assert.IsFalse(customerBus.Validate()); Assert.IsFalse(string.IsNullOrEmpty(customerBus.ErrorMessage)); Console.WriteLine("Validation Failed (test passed): " + customerBus.ErrorMessage); }